#include <stdio.h>
#include <stdlib.h>

#include "sdl.h"
#include "types.h"
#include "video.h"

#define WIDTH 640
#define HEIGHT 480
#define BPP 4
#define DEPTH 32

void setpixel(SDL_Surface *screen, int x, int y, Uint8 r, Uint8 g, Uint8 b)
{
    Uint32 *pixmem32;
    Uint32 colour;

    colour = SDL_MapRGB(screen->format, r, g, b);

    pixmem32 = (Uint32*) screen->pixels  + y + x;
    *pixmem32 = colour;
}


void DrawScreen(SDL_Surface* screen, int h)
{
    int x, y, ytimesw;

    if (SDL_MUSTLOCK(screen))
    {
        if (SDL_LockSurface(screen) < 0) return;
    }

    for (y = 0; y < screen->h; y++)
    {
        ytimesw = y*screen->pitch/BPP;
        for (x = 0; x < screen->w; x++)
        {
            setpixel(screen, x, ytimesw, (x*x)/256+3*y+h, (y*y)/256+x+h, h);
        }
    }

    if (SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen);

    SDL_Flip(screen);
}


int main(int argc, char* argv[])
{
    SDL_Surface *screen;
    SDL_Event event;

    int keypress = 0;
    int h=0;

    init_video();

    screen = set_videomode(WIDTH, HEIGHT, DEPTH);

    while (!keypress)
    {
        DrawScreen(screen,h++);
        while (SDL_PollEvent(&event))
        {
            switch (event.type)
            {
            case SDL_QUIT:
                keypress = 1;
                break;
            case SDL_KEYDOWN:
                keypress = 1;
                break;
            }
        }
    }

    SDL_Quit();

    return 0;
}




/*
int main(int argc, char** argv)
{


}
*/
